1. Monochrome:
Monochrome displays output images using a single foreground color- Many of the earliest monochrome devices were of the black-and-white variety, providing white text on a black background.
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Through a technique known as reverse video (reversing the color of the pixels), black text on a white background is also possible.
Over the years, a number of studies have shown that people become less fatigued when working with amber or green on a black background. Although such studies have produced conflicting results, many of the display devices now available in the marketplace are of the amber or green type.
Image Source:phoenixdisplay.com
2. Color :
Most color displays are of the red- green-blue (RGB) type. Those of the highest resolution work with beams whose intensities vary by analog rather than by digital means.
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Depending on such factors as the sophistication of the display unit itself and the amount of RAM available with the computer, users may be able to display from 8 to 16,(XX),000 colors.
Business users who require presentation graphics output often need only a few colors, but people such as artists and product designers need many, many more. Display devices that meet the latter set of needs often cost several thousand dollars.
Nonetheless, users who have only eight or so colors available can create the illusion of many more colors by painting alternate pixels different colors. For example, painting alternate pixels yellow and green produces a lime color.
Monochrome display devices have advantages over color ones in that they are cheaper, generally provide better resolution for text display (an important consideration if the display will be used extensively for word processing), and emit less radiation. But if you need more than single color, only a color monitor will suffice.